YMF724F
2-3. MPU401
This block is for transmitting and receiving MIDI data. It is compatible with UART mode of “MPU401”.
Full duplex operation is possible using the 16-byte FIFO for each direction, transmitting and receiving.
The following shows the MPUBase I/O map for MPU401.
MPUBase
(R/W)
(R)
MIDI Data port
MPUBase + 1h
MPUBase + 1h
Status Register port
Command Register port
(W)
port
D7
D6
D5
D4
D3
D2
D1
D0
+0h
Data
Command
+1h (W)
+1h (R)
/DSR
/DRR
-
-
-
-
-
-
2-4. Joystick
JSBase
(R/W)
port
+0h
D7
D6
D5
D4
D3
D2
D1
D0
JBB2
JBB1
JAB2
JAB1
JBCY
JBCX
JACY
JACX
JACX...
JACY...
JBCX...
JBCY...
JAB1...
JAB2...
JBB1...
JBB2...
Joystick A, Coordinate X
Joystick A, Coordinate Y
Joystick B, Coordinate X
Joystick B, Coordinate Y
Joystick A, Button 1
Joystick A, Button 2
Joystick B, Button 1
Joystick B, Button 2
January 14, 1999
-37-
YAMAHA [ YAMAHA CORPORATION ]
